I'm not sure how soon you can plant outside. I am in zone 6b and I will be putting my plants out at the end of May. You are in zone 5.
I will be planting my seeds April 1. Should you be planting now? Unless you want to plant gallon size plants, maybe not. The first year a moved to Reno, I planted my seeds March 1 (as I had always done in California). By the time I could plant them outside, they were 3 feet tall and had little tomatoes on them.
Daisy
